Red Hat Enterprise Linux 9 Essentials: Learn to Install, Administer and Deploy RHEL 9 Systems
- Length: 381 pages
- Edition: P
- Language: English
- Publisher: Payload Media
- Publication Date: 2023-04-20
- ISBN-10: B0C36ZD88X
- Sales Rank: #0 (See Top 100 Books)
Arguably one of the most highly regarded and widely used enterprise-level operating systems available today is the Red Hat Enterprise Linux (typically shortened to RHEL and pronounced rell) distribution. Not only is it considered to be among the most stable and reliable operating systems, it is also backed by the considerable resources and technical skills of Red Hat, Inc. Red Hat Enterprise Linux 9 Essentials is designed to provide detailed information on the installation, use, and administration of the Red Hat Enterprise Linux 9 distribution. For beginners, the book covers topics such as operating system installation, the basics of the GNOME desktop environment, configuring email and web servers, and installing packages and system updates using App Streams. Additional installation topics, such as dual booting with Microsoft Windows, are also covered, together with all important security topics, such as configuring a firewall and user and group administration.
For the experienced user, topics such as remote desktop access, the Cockpit web interface, logical volume management (LVM), disk partitioning, swap management, KVM virtualization, Secure Shell (SSH), Linux Containers, and file sharing using both Samba and NFS are covered in detail to provide a thorough overview of this enterprise class operating system.
1. Introduction 1.1 Superuser Conventions 1.2 Opening a Terminal Window 1.3 Editing Files 1.4 Feedback 1.5 Errata 2. A Brief History of Red Hat Linux 2.1 What exactly is Linux? 2.2 UNIX Origins 2.3 Who Created Linux? 2.4 The Early Days of Red Hat 2.5 Red Hat Support 2.6 Open Source 2.7 The Fedora Project 2.8 CentOS Stream - The Free Alternative 2.9 Summary 3. Installing RHEL 9 on a Clean Disk Drive 3.1 Obtaining the RHEL 9 Installation Media 3.2 Writing the ISO Installation Image to a USB Drive 3.2.1 Linux 3.2.2 macOS 3.2.3 Windows/macOS 3.3 Installing Red Hat Enterprise Linux 9 3.4 Partitioning a Disk for RHEL 9 3.5 Disk Encryption 3.6 User Settings 3.7 Registering the System 3.8 The Physical Installation 3.9 Final Configuration Steps 3.10 Installing Updates 3.11 Displaying Boot Messages 3.12 Summary 4. Dual Booting RHEL 9 with Windows 4.1 Partition Resizing 4.2 Changing the Default Boot Option 4.3 Accessing the Windows Partition from RHEL 9 4.4 Summary 5. Allocating Windows Disk Partitions to RHEL 9 5.1 Unmounting the Windows Partition 5.2 Deleting the Windows Partitions from the Disk 5.3 Formatting the Unallocated Disk Partition 5.4 Mounting the New Partition 5.5 Summary 6. A Guided Tour of the GNOME 40 Desktop 6.1 Installing the GNOME Desktop 6.2 An Overview of the GNOME 40 Desktop 6.3 Activity Overview 6.4 Managing Windows 6.5 Using Workspaces 6.6 Calendar and Notifications 6.7 GNOME Desktop Settings 6.8 Beyond Basic Customization 6.9 Summary 7. An Overview of the Cockpit Web Interface 7.1 An Overview of Cockpit 7.2 Installing and Enabling Cockpit 7.3 Accessing Cockpit 7.4 Overview 7.5 Logs 7.6 Storage 7.7 Networking 7.8 Accounts 7.9 Services 7.10 Applications 7.11 Virtual Machines 7.12 Software Updates 7.13 Terminal 7.14 Connecting to Multiple Servers 7.15 Enabling Stored Metrics 7.16 Summary 8. Using the Bash Shell on RHEL 9 8.1 What is a Shell? 8.2 Gaining Access to the Shell 8.3 Entering Commands at the Prompt 8.4 Getting Information about a Command 8.5 Bash Command-line Editing 8.6 Working with the Shell History 8.7 Filename Shorthand 8.8 Filename and Path Completion 8.9 Input and Output Redirection 8.10 Working with Pipes in the Bash Shell 8.11 Configuring Aliases 8.12 Environment Variables 8.13 Writing Shell Scripts 8.14 Summary 9. Managing RHEL 9 Users and Groups 9.1 User Management from the Command-line 9.2 User Management with Cockpit 9.3 User Management using the Settings App 9.4 Summary 10. Understanding RHEL 9 Software Installation and Management 10.1 Repositories 10.2 The BaseOS Repository 10.3 The AppStream Repository 10.4 Summary 11. Managing RHEL 9 systemd Units 11.1 Understanding RHEL 9 systemd Targets 11.2 Understanding RHEL 9 systemd Services 11.3 RHEL 9 systemd Target Descriptions 11.4 Identifying and Configuring the Default Target 11.5 Understanding systemd Units and Unit Types 11.6 Dynamically Changing the Current Target 11.7 Enabling, Disabling, and Masking systemd Units 11.8 Working with systemd Units in Cockpit 11.9 Summary 12. RHEL 9 Network Management 12.1 An Introduction to NetworkManager 12.2 Installing and Enabling NetworkManager 12.3 Basic nmcli Commands 12.4 Working with Connection Profiles 12.5 Interactive Editing 12.6 Configuring NetworkManager Permissions 12.7 Summary 13. RHEL 9 Firewall Basics 13.1 Understanding Ports and Services 13.2 Securing Ports and Services 13.3 RHEL 9 Services and iptables Rules 13.4 Well-Known Ports and Services 13.5 Summary 14. RHEL 9 Firewall Configuration with firewalld 14.1 An Introduction to firewalld 14.1.1 Zones 14.1.2 Interfaces 14.1.3 Services 14.1.4 Ports 14.2 Checking firewalld Status 14.3 Configuring Firewall Rules with firewall-cmd 14.3.1 Identifying and Changing the Default Zone 14.3.2 Displaying Zone Information 14.3.3 Adding and Removing Zone Services 14.3.4 Working with Port-based Rules 14.3.5 Creating a New Zone 14.3.6 Changing Zone/Interface Assignments 14.3.7 Masquerading 14.3.8 Adding ICMP Rules 14.3.9 Implementing Port Forwarding 14.4 Managing firewalld from the Cockpit Interface 14.5 Managing firewalld using firewall-config 14.6 Summary 15. Configuring SSH Key-based Authentication on RHEL 9 15.1 An Overview of Secure Shell (SSH) 15.2 SSH Key-based Authentication 15.3 Setting Up Key-based Authentication 15.4 Installing and Starting the SSH Service 15.5 SSH Key-based Authentication from Linux and macOS Clients 15.6 Managing Multiple Keys 15.7 SSH Key-based Authentication from Windows Clients 15.8 SSH Key-based Authentication using PuTTY 15.9 Generating a Private Key with PuTTYgen 15.10 Summary 16. RHEL 9 Remote Desktop Access with VNC 16.1 Secure and Insecure Remote Desktop Access 16.2 Installing the GNOME Desktop Environment 16.3 Installing VNC on RHEL 9 16.4 Configuring the VNC Server 16.5 Connecting to a VNC Server 16.6 Establishing a Secure Remote Desktop Session 16.7 Establishing a Secure Tunnel on Windows using PuTTY 16.8 Shutting Down a Desktop Session 16.9 Troubleshooting a VNC Connection 16.10 Summary 17. Displaying RHEL 9 Applications Remotely (X11 Forwarding) 17.1 Requirements for Remotely Displaying RHEL 9 Applications 17.2 Displaying a RHEL 9 Application Remotely 17.3 Trusted X11 Forwarding 17.4 Compressed X11 Forwarding 17.5 Displaying Remote RHEL 9 Apps on Windows 17.6 Summary 18. Using NFS on RHEL 9 to Share Files with Remote Systems 18.1 Ensuring NFS Services are running on RHEL 9 18.2 Configuring the RHEL 9 Firewall to Allow NFS Traffic 18.3 Specifying the Folders to be Shared 18.4 Accessing Shared Folders 18.5 Mounting an NFS Filesystem on System Startup 18.6 Unmounting an NFS Mount Point 18.7 Accessing NFS Filesystems in Cockpit 18.8 Summary 19. Sharing Files between RHEL 9 and Windows Systems with Samba 19.1 Accessing Windows Resources from the GNOME Desktop 19.2 Samba and Samba Client 19.3 Installing Samba on RHEL 9 19.4 Configuring the RHEL 9 Firewall to Enable Samba 19.5 Configuring the smb.conf File 19.5.1 Configuring the [global] Section 19.5.2 Configuring a Shared Resource 19.5.3 Removing Unnecessary Shares 19.6 Configuring SELinux for Samba 19.7 Creating a Samba User 19.8 Testing the smb.conf File 19.9 Starting the Samba and NetBIOS Name Services 19.10 Accessing Samba Shares 19.11 Accessing Windows Shares from RHEL 9 19.12 Summary 20. An Overview of Virtualization Techniques 20.1 Guest Operating System Virtualization 20.2 Hypervisor Virtualization 20.2.1 Paravirtualization 20.2.2 Full Virtualization 20.2.3 Hardware Virtualization 20.3 Virtual Machine Networking 20.4 Summary 21. Installing KVM Virtualization on RHEL 9 21.1 An Overview of KVM 21.2 KVM Hardware Requirements 21.3 Preparing RHEL 9 for KVM Virtualization 21.4 Verifying the KVM Installation 21.5 Summary 22. Creating KVM Virtual Machines on RHEL 9 using Cockpit 22.1 Installing the Cockpit Virtual Machines Module 22.2 Creating a Virtual Machine in Cockpit 22.3 Starting the Installation 22.4 Working with Storage Volumes and Storage Pools 22.5 Summary 23. Creating KVM Virtual Machines on RHEL 9 using virt-manager 23.1 Starting the Virtual Machine Manager 23.2 Configuring the KVM Virtual System 23.3 Starting the KVM Virtual Machine 23.4 Summary 24. Creating KVM Virtual Machines with virt-install and virsh 24.1 Running virt-install to build a KVM Guest System 24.2 An Example RHEL 9 virt-install Command 24.3 Starting and Stopping a Virtual Machine from the Command-Line 24.4 Creating a Virtual Machine from a Configuration File 24.5 Summary 25. Creating a RHEL 9 KVM Networked Bridge Interface 25.1 Getting the Current Network Manager Settings 25.2 Creating a Network Manager Bridge from the Command-Line 25.3 Declaring the KVM Bridged Network 25.4 Using a Bridge Network in a Virtual Machine 25.5 Creating a Bridge Network using nm-connection-editor 25.6 Summary 26. Managing KVM using the virsh Command-Line Tool 26.1 The virsh Shell and Command-Line 26.2 Listing Guest System Status 26.3 Starting a Guest System 26.4 Shutting Down a Guest System 26.5 Suspending and Resuming a Guest System 26.6 Saving and Restoring Guest Systems 26.7 Rebooting a Guest System 26.8 Configuring the Memory Assigned to a Guest OS 26.9 Summary 27. An Introduction to Linux Containers 27.1 Linux Containers and Kernel Sharing 27.2 Container Uses and Advantages 27.3 RHEL 9 Container Tools 27.4 Container Catalogs, Repositories, and Registries 27.5 Container Networking 27.6 Summary 28. Working with Containers on RHEL 9 28.1 Installing the Container Tools 28.2 Logging in to the Red Hat Container Registry 28.3 Pulling a Container Image 28.4 Running the Image in a Container 28.5 Managing a Container 28.6 Saving a Container to an Image 28.7 Removing an Image from Local Storage 28.8 Removing Containers 28.9 Building a Container with Buildah 28.10 Building a Container from Scratch 28.11 Container Bridge Networking 28.12 Managing Containers in Cockpit 28.13 Summary 29. Setting Up a RHEL 9 Web Server 29.1 Requirements for Configuring a RHEL 9 Web Server 29.2 Installing the Apache Web Server Packages 29.3 Configuring the Firewall 29.4 Port Forwarding 29.5 Starting the Apache Web Server 29.6 Testing the Web Server 29.7 Configuring the Apache Web Server for Your Domain 29.8 The Basics of a Secure Website 29.9 Configuring Apache for HTTPS 29.10 Obtaining an SSL Certificate 29.11 Summary 30. Configuring a RHEL 9 Postfix Email Server 30.1 The Structure of the Email System 30.1.1 Mail User Agent 30.1.2 Mail Transfer Agent 30.1.3 Mail Delivery Agent 30.1.4 SMTP 30.1.5 SMTP Relay 30.2 Configuring a RHEL 9 Email Server 30.3 Postfix Pre-Installation Steps 30.4 Firewall/Router Configuration 30.5 Installing Postfix on RHEL 9 30.6 Configuring Postfix 30.7 Configuring DNS MX Records 30.8 Starting Postfix on a RHEL 9 System 30.9 Testing Postfix 30.10 Sending Mail via an SMTP Relay Server 30.11 Summary 31. Adding a New Disk Drive to a RHEL 9 System 31.1 Mounted File Systems or Logical Volumes 31.2 Finding the New Hard Drive 31.3 Creating Linux Partitions 31.4 Creating a File System on a RHEL 9 Disk Partition 31.5 An Overview of Journaled File Systems 31.6 Mounting a File System 31.7 Configuring RHEL 9 to Mount a File System Automatically 31.8 Adding a Disk Using Cockpit 31.9 Summary 32. Adding a New Disk to a RHEL 9 Volume Group and Logical Volume 32.1 An Overview of Logical Volume Management (LVM) 32.1.1 Volume Group (VG) 32.1.2 Physical Volume (PV) 32.1.3 Logical Volume (LV) 32.1.4 Physical Extent (PE) 32.1.5 Logical Extent (LE) 32.2 Getting Information about Logical Volumes 32.3 Adding Additional Space to a Volume Group from the Command-Line 32.4 Adding Additional Space to a Volume Group Using Cockpit 32.5 Summary 33. Adding and Managing RHEL 9 Swap Space 33.1 What is Swap Space? 33.2 Recommended Swap Space for RHEL 9 33.3 Identifying Current Swap Space Usage 33.4 Adding a Swap File to a RHEL 9 System 33.5 Adding Swap as a Partition 33.6 Adding Space to a RHEL 9 LVM Swap Volume 33.7 Adding Swap Space to the Volume Group 33.8 Summary 34. RHEL 9 System and Process Monitoring 34.1 Managing Processes 34.2 Real-time System Monitoring with top 34.3 Command-Line Disk and Swap Space Monitoring 34.4 Summary Index
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